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Evan Williams Heads List of Twitter Shareholders

NEW YORK (TheStreet) -- Twitter co-founder Evan Williams is tops among the company's shareholders as the mico-blogging site seeks to sell $1 billion in stock through an initial public offering.

Twitter said in an IPO filing with the Securities and Exchange Commission released on Thursday that Williams will own 12.1% of the company's stock. David Rosenblatt will own 6.7% of the firm's shares, while co-founder and current Square head Jack Dorsey will own 4.9%. Twitter CEO Dick Costolo owns 1.6% of the company's shares, according to the filing.

The San Francisco-based company also listed venture capital firms Spark Capital, Benchmark Capital Partners, Union Square Ventures, Rizvi Traverse and DST Global as other shareholders with a stake of 5% or more in the company.

Twitter's calculation's are based the company's 473,839,475 shares of common stock outstanding as of August 31, 2013.

According to the filing, Twitter's revenue in 2012 totaled $316.9 million. The company's revenue for the first six months of 2013 totaled $253.6 million, the filing said.

Twitter noted that revenue grew by 198% from 2011 to 2012, while net loss decreased by 38% to $79.4 million. During that same timeframe, Adjusted EBITDA increased by 149% to $21.2 million.

The company now has over 200 million monthly active users MAUsand over 500 million tweets are sent on its network each day.

"We have more than 215 million MAUs from around the world. People come to Twitter for many reasons, and we believe that two of the most significant are the breadth of Twitter content and our broad reach," the company said in its filing.